Two legs of a right triangle measure 3 and 4, respectively. What is the area of the circle that circumscribes the triangle?

The perimeter of a circle is 36 π. What is the diameter of the circle?

Note: Figure NOT drawn to scale.

In the above circle, the length of arc is , and . What is the diameter of the circle?

If the area of the circle touching the square in the picture above is , what is the closest value to the area of the square?

Note: Figure NOT drawn to scale.

In the above circle, the length of arc is 10, and . Give the diameter of the circle. (Nearest tenth).

If the area of a circle is four times larger than the circumference of that same circle, what is the diameter of the circle?